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ABB DO828 Digital Output Relay Module

The ABB DO828 3BSE069055R1, also cataloged as the DO828 Digital Output Relay Module, executes isolated relay switching operations for S800 I/O systems through 16 channel discrete output interfaces.

Hardware Specifications

Parameter	Specification
Model	DO828 3BSE069055R1
Brand	ABB
Product Type	Digital Output Relay Modules
Origin	Sweden
Weight	0.18 kg
Dimensions	Width 45 mm, Depth 102 mm, 111 mm including connector, Height 119 mm
Operating Temp	0 to +55 deg C
Power Consumption	Typ. 3.5 W
System Platform	ABB S800 I/O
Signal Type	Relay output, normally open (NO)
Number of Channels	16
Output Voltage	5 to 125 VDC / 5 to 250 VAC
Maximum Output Current	2 A continuous
Isolation	Individually isolated channel-to-channel and channel-to-circuit common
Rated Insulation Voltage	250 V
Dielectric Test Voltage	2000 VAC
Maximum Field Cable Length	600 m
HART Support	No
SOE Support	No
Redundancy	No
High Integrity	No
Intrinsic Safety	No
Compatible MTU	TU851
Keying Code	ED
ModuleBus Current Consumption +5 V	45 mA
ModuleBus Current Consumption +24 V	80 mA
External +24 V Consumption	0

ABB S800 I/O Relay Output Architecture

The DO828 integrates relay driver circuits, optical isolation barriers, output status LEDs, relays, and EMC protection components on each output channel. Therefore, every relay output maintains electrical separation between channels and the common circuit reference.

The module receives relay supply supervision through the 12 V distribution available on the ModuleBus. Additionally, the supervision circuit generates module error information when the relay supply voltage disappears. The warning LED indicates the detected condition, and the diagnostic status transfers through the ModuleBus communication interface.

The DO828 supports industrial control applications requiring isolated switching of AC and DC loads. Furthermore, the module provides channel-level status indication through front panel LEDs for fault, run, OSP, and individual channel states.

Frequently Asked Questions

Q: Does the ABB DO828 support channel-to-channel electrical isolation?
A: Yes. The DO828 provides individual isolation between channels and between channels and the circuit common.

Q: What type of loads can the DO828 relay outputs control?
A: The module supports relay-based switching for loads up to 125 VDC or 250 VAC with a maximum continuous current of 2 A per channel.

Q: How does the module detect relay supply voltage failure?
A: The DO828 monitors the 12 V relay supply converter from the ModuleBus and reports module error and warning conditions through the S800 I/O diagnostic system.

Field Installation Guidelines

Install the DO828 on an ABB S800 I/O assembly with the specified TU851 Module Termination Unit. Verify that the MTU keying code matches the module configuration before insertion.

Route field wiring separately from high-energy switching cables to reduce electromagnetic interference. Maintain correct terminal identification during relay load connection because incorrect wiring can affect switching behavior.

Connect protective grounding according to the installation requirements of the control cabinet. Ensure that enclosure protection, environmental conditions, and cable routing follow IEC/EN 61131-2 installation practices.

Before commissioning, verify relay output states through the S800 I/O diagnostic interface and confirm LED status indications for each connected channel.

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